Abstract
A study of the species of Ceratocystis found in Ontario on decaying slash has been made and most of the species grown in pure culture. The characteristics of the genus and the separation of species are discussed. Four species found on wood of coniferous trees are described as new. Illustrations are included for all of these. Ceratocystis brunneocrinita Wright and Cain is described from several collections of Abies balsamea. The perithecia have brown ostiolar hyphae and the ascospores appear rectangular. Ceratocystis europhioides Wright and Cain, on Pinus and Picea, has ascospores similar to but larger than the nonostiolate Europhium trinacriforme Parker. Ceratocystis falcata Wright and Cain, on Pinus, resembles Ceratocystis minuta (Siem.) Hunt but is distinguished by the longer, septate ascospores. Ceratocystis sagmatospora Wright and Cain, on Pinus and Picea, has saddle-shaped ascospores with elaborate gelatinous sheaths.
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